well i've got a 1979 red block in my vl, the only thing i have to do for rego is put the vl black heads, manifold & carby on and they will pass it
btw i voted the red block, because mine is bored out 80tho
... to answer your question have a look at the head gaskets and make sure there the same layout.. i know u can use vb heads on the vl.. the paterns start to change at the inlet manifold.